Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
43 Cards in this Set
- Front
- Back
Which fo the following is the correct sequence of events for muscle contractions?
A)neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR,ATP-driven power stroke B)muscle cell action potential, neurotransmitter release,ATP-driven power stroke,calcium ion release from SR,sliding of myofilaments C)neurotransmitter release,muscle cell action potential,motor neuron action potential,release of calcium ions from SR, Sliding of myofilaments, ATP-driven power stroke D)motor neuron action potential, neurotransmitter release,muslce cell action potential, release of calcium ions from SR, ATP-driven power stroke,Sliding myofilaments |
D)motor neuron action potential, neurotransmitter release,muslce cell action potential, release of calcium ions from SR, ATP-driven power stroke,Sliding myofilaments
|
|
Excitation-contraction coupling requires whichof the following substances?
|
Ca2+ and ATP
|
|
What is the main factor that determines the power of a muscle?
|
the total number of muscle cells available for contraction
|
|
What part of the sarcolema contains acetycholine receptors?
|
motor end plate
|
|
Which of the following muscle pairs are antagoists of each other?
A)sternocleidomastoid and splenius capitis B)pectoralis major and pectoralis minor C)biceps femoris and semitendinosus D)rectus femoris and vastus medialis |
A)sternocleidomastoid and splenius capitis
|
|
Mucle tone is____.
A)the condition of athletes after intesive training B)the ability of a muscle to effeciently cause skeletal movements C)the feeling of well-being following excercise D)a state of sustained partial contraction |
D)a state of sustained partial contraction
|
|
Immediatly following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _______period during which the events of excitation-contraction coupling occur.
|
latent
|
|
What is the role of tropomysin in skeletal muscles?
A)Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules B)Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. C)Tropomyosin is the name of a contracting unit. D)Tropomyosin is the receptor for the motor neuron neurotransmitter. |
B)Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
|
|
Hyothetically, if the skeletal muscle were stretched to the point where thick and thin filaments no longer overlapped_____.
A)ATP consumption would increase because the sacromere is "trying" to contract B)no muscle tension could be generated C)maxium force production would result because the muscle has a maximum range of travel D)cross bridge attachment would be optimum because of all the free binding sites on actin. |
B)no muscle tension could be generated
|
|
What is the fuctional role of the T-tubules?
A)synthesize the ATP to provide energy for muscle contraction B)stabilize the G and F actin C)enhanc cellular communication during muscle contration D)hold cross bridges in place in a resting muscle |
C)enhanc cellular communication during muscle contration
|
|
When the term biceps,tricepts, or quadricepts form part of a mucscles name, what does it tell you about the muscle.
|
the muscle has two, three or four origins respectively.
|
|
Which of the following muscles is not a facial muscle?
A)Masseter B)orbicularis oculi C)zygomaticus minor D)trapezius |
D)trapezius
|
|
Myoglobin______.
|
stores oxygen in muscle cells
|
|
Which of the following doesn't compress the abdomen?
A)transversus abdominis B)external oblique C)coccygeus D)internal oblique |
C)coccygeus
|
|
Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are______.
|
muliunit muscle
|
|
Which muscles is (are) comtracted to exhale forcibly.
A)internal intercostals B)diaphragm C)internal intercostals and external intercostals D)external intercostals and diaphragm |
A)internal interostals
|
|
The extensor carpi radialis pattern_____.
A)extends the thumb and is a deep muscle B)extends and abducts the wirst and is short C)supinates the forearm and is a superficial muscle D)extends and adducts the wirst and has a small tendon |
B)extends and abducts the wirst and is short
|
|
In a pennate muscle pattern______.
A)muscles appear to be straplike B)there is a broad origin and fascicles converge toward a single tendon C)there is a narrow origin diverging to a broad insertion D)muscles look like a feather |
D)muscles look like a feather
|
|
Which muscle cells have the greatest ability to regenerate?
|
smooth
|
|
which of the following are composed of myosin?
A)thick filaments B)all myofilaments C)Z discs D)thin filaments |
A)thick filaments
|
|
Activate synaptic vesicles in axon terminals.
|
calcium ions
|
|
Influx results i muscle cell depolarization
|
sodium ions
|
|
Released from the motor neuron to initiate muscle depolarization.
|
Acetylcholine
|
|
The situation in wich contractions become stronger due to stimulation before complete relaxation occurs.
|
wave summation
|
|
The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle.
|
Maximal stimulus
|
|
Continued sustained smooth contraction due to rapid stimulation.
|
tetanus
|
|
Muscle that opposes and reverses the action of another muscle.
|
Anatagonist
|
|
Muscle that is primarily responsible for bring about a particular movement.
|
Prime mover
|
|
Muscle that stabilizes the origin of another muscle.
|
fixator
|
|
Muscle that aids another by promoting the same movement
|
synergist
|
|
The diaphragm is the prime moverof inspiratory breathing
|
True
|
|
Extensor digitorum longus is found in the forearm
|
false
|
|
Myosin and actin are present in all three types of muscle tissue.
|
true
|
|
The epimysium is the connective tissue layer that surrounds a muscle fiber.
|
false
|
|
sacromeres are present in smooth muscle
|
false
|
|
Calcium is returned to the terminal cisternae through active transport
|
true
|
|
Varicosities are seen in skeletal muscles and in multiunit smooth muscle.
|
false
|
|
Slow oxidative fibers have fast contractions and fatigue rapidly.
|
false
|
|
During a muscle contraction the thick filaments are moved toward the center of the sacromere.
|
false
|
|
an ismetric contraction is one where tension increases but muscle length doesn't change.
|
True
|
|
Only_____muscle cells commonly branch.
|
cardiac
|
|
Thick filaments are found in the _____of the sacromere.
|
H-zone
|
|
The ______is the main chewing muscle.
|
masseter
|